Glass break sound for molotovs

Fix typo in campaign
Update tooltip for immunity flag

data/bullets.json

@@ -185,14 +185,14 @@
         "GravityFactor": 1,
         "DestroyOnDrop": true,
         "DropGuns": [
-          "fire_explosion"
+          "molotov_explosion"
         ]
       },
       "OutOfRangeGuns": [
-        "fire_explosion"
+        "molotov_explosion"
       ],
       "HitGuns": [
-        "fire_explosion"
+        "molotov_explosion"
       ]
     },
     {

data/guns.json

@@ -372,6 +372,16 @@
       "ElevationLow": 22,
       "ElevationHigh": 30
     },
+    {
+      "Pic": "",
+      "Name": "molotov_explosion",
+      "Bullet": "molotov_flame",
+      "Sound": "glass_break",
+      "Recoil": 6.28,
+      "SpreadCount": 16,
+      "ElevationLow": 22,
+      "ElevationHigh": 30
+    },
     {
       "Pic": "",
       "Name": "gas_poison_explosion",

missions/ai_insurgency.cdogscpn/missions.json

@@ -36,7 +36,7 @@
 			"Flags": 0
 		},
 		{
-			"Description": "Kill misterious attackers",
+			"Description": "Kill mysterious attackers",
 			"Type": "Kill",
 			"Index": 0,
 			"Count": 4,

sounds/glass_break.txt

@@ -0,0 +1,3 @@
+Derived from Breaking Bottle by spookymodem
+https://opengameart.org/content/breaking-bottle
+http://creativecommons.org/licenses/by/3.0/

src/cdogsed/char_editor.c

@@ -598,7 +598,7 @@ static bool Draw(SDL_Window *win, struct nk_context *ctx, void *data)
 
 			nk_layout_row_dynamic(ctx, ROW_HEIGHT, 2);
 			DrawFlag(ctx, ec, "Asbestos", FLAGS_ASBESTOS, "Immune to fire");
-			DrawFlag(ctx, ec, "Immunity", FLAGS_IMMUNITY, "Immune to poison");
+			DrawFlag(ctx, ec, "Immunity", FLAGS_IMMUNITY, "Immune to poison and petrify");
 			DrawFlag(ctx, ec, "See-through", FLAGS_SEETHROUGH, NULL);
 			DrawFlag(ctx, ec, "Invulnerable", FLAGS_INVULNERABLE, NULL);
 			DrawFlag(